The US is an extremely large country with a lot of variety. While Faithful Wife grew up in small towns that were clearly racist, Red Sonja did not.
I've lived in many places around the USA. Some where racism was very much part of the culture (Atlanta, NYC, NJ) and other where it just did not seem to be a big deal. But when there was racism, it was not from just one race.
When the Irish came to the USA, they were coming from a country where they were treated horribly with genocide, starvation, forced labor/slavery, etc. And then came to the USA and were treated horribly.
When the big Italian immigration happened, it was a lot of people running from famine and wars. They too were treated horribly. My mother and her family had no 'white privilege'. When we lived in Atlanta, by law, my parents were not considered legally married because Italians were considered non-white. Even my generation experience a lot of this discrimination. Shoot a few years ago at work, one of my co-workers starting ranting on about how Italians are sub-humans and to my surprise, others joined in. (I should have gone to HR but was concerned about backlash.)
White privilege is the topic. Not minority oppression. Not bigotry. Not racism, well not specifically racism. Racism is a part of white privilege only in that racism is part of what created white privilege.
While everything you said above is true it doesn't refute the fact that white people have grown up with privileges black people have not.
Those in the LGBTQ community have also been oppressed but the white LGBTQ have still enjoyed white privilege.
When the Germans immigrated they were despised ....until word got around their beer was outstanding...hee hee.
When the Irish came they were despised.
When the Italians came they were despised.
None of those minority groups were subject to lynchings, to being owned property, or to be subject to laws designed to deny them education or jobs or housing. Consider slavery ended after the civil war ended, 1865. But black people were routinely denied rights and were subject to extreme segregation for another 100 years.